MALICIOUS
200
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Service Execution: Visual Basic
T1204.002 Malicious Link/Object: Malicious File
The file is an Excel 4.0 macro-enabled workbook. Critical heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function. The macro constructs URLs by concatenating strings, such as 'http://heijts.com/wp-content/vIbOiEZZbqTvF10Z9/', and also attempts to execute 'regsvr32.exe'. This indicates the file's purpose is to download and execute a second-stage payload, consistent with Emotet downloader behavior.
Heuristics 4
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Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAMEoletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
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XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FNExcel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
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ClamAV: Doc.Downloader.Emotet04220-9942582-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Doc.Downloader.Emotet04220-9942582-0
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Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPENWorkbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txt5916f679082efc18ea64a7b5dff941d98d6004f291cc57a7a9b206d7b455d7c5 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 7323 bytes |
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